The fluid from the clutch is leaking
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You need to find where the leak is coming from, the clutch master cylinder, the line and or the clutch slave cylinder etc, the slave cylinder is in the bell housing as it is part of the throw-out bearing assembly, and the transmission has to come out to replace it, at that point it is recommended to just put a complete clutch kit in it, and I would do the clutch master cylinder while at it…
But remember that the clutch system also has a remote reservoir, not sure if separate or part of the brake master reservoir, but it can leak anywhere from the reservoir to the slave cylinder…